Law of Conservation of Mass in Chemical Reactions
Chemistry ⇒ Chemical Reactions and Equations
Law of Conservation of Mass in Chemical Reactions starts at 9 and continues till grade 12.
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A chemical reaction in a sealed container starts with 100 g of reactants. After the reaction, the products and container together still weigh 100 g. What does this demonstrate?
A chemical reaction takes place in an open beaker and the mass of the products is found to be less than the mass of the reactants. What could be a possible explanation?
A reaction vessel contains 50 g of reactants. After the reaction, the products are collected and found to weigh 48 g. What could explain this discrepancy?
Describe a scenario where the Law of Conservation of Mass appears to be violated and explain why.
A chemical reaction in a sealed container starts with 100 g of reactants. After the reaction, the products and container together still weigh 100 g. What does this demonstrate?
A chemical reaction takes place in an open beaker and the mass of the products is found to be less than the mass of the reactants. What could be a possible explanation?
A reaction vessel contains 50 g of reactants. After the reaction, the products are collected and found to weigh 48 g. What could explain this discrepancy?
A student burns 2 g of magnesium in air and obtains 3.3 g of magnesium oxide. What is the mass of oxygen that reacted?
Which of the following best describes the Law of Conservation of Mass?
(1) The mass of products is always greater than the mass of reactants.
(2) The mass of reactants is always greater than the mass of products.
(3) The mass of reactants equals the mass of products.
(4) Mass can be created during a chemical reaction.
Which of the following best explains why mass appears to decrease in some chemical reactions?
(1) Mass is destroyed during the reaction.
(2) Some products escape as gases in an open system.
(3) The Law of Conservation of Mass does not apply.
(4) Atoms are converted into energy.
Which of the following is a direct implication of the Law of Conservation of Mass?
(1) Atoms are destroyed in chemical reactions.
(2) The total number of atoms remains constant during a reaction.
(3) Mass can be created in a chemical reaction.
(4) The mass of products is always less than the mass of reactants.
Which of the following is NOT a consequence of the Law of Conservation of Mass?
(1) Chemical equations must be balanced.
(2) The total number of atoms of each element is conserved.
(3) Mass can be lost in a closed system.
(4) The mass of reactants equals the mass of products.
Fill in the blank: According to the Law of Conservation of Mass, the mass of the _______ must equal the mass of the products in a chemical reaction.
Fill in the blank: In a chemical reaction, the total mass of the system _______ (increases/decreases/remains the same).
Fill in the blank: The Law of Conservation of Mass is also known as the Law of Conservation of _______.
Fill in the blank: The Law of Conservation of Mass is valid only in a _______ system.
True or False: In a closed system, the total mass before and after a chemical reaction remains the same.
True or False: The Law of Conservation of Mass applies only to physical changes, not chemical reactions.
True or False: The Law of Conservation of Mass is not applicable to open systems where matter can enter or leave.
True or False: The Law of Conservation of Mass is universally applicable to all chemical reactions under normal laboratory conditions.
